Spacewalkers Bob Behnken (left) and Chris Cassidy (right) in the Quest Airlock on June 26, 2020, before beginning a spacewalk to replace batteries on one of two power channels on the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/ebir4gdxsaqaxnu.jpg

June 30 is Asteroid Day. http://www.nasa.gov/sites/default/files/thumbnails/image/2166_ds1palomar_opt.jpg

On June 26, 2020, NASA astronauts Bob Behnken and Chris Cassidy conducted the first of two spacewalks to swap batteries and upgrade power systems on the International Space Station. http://www.nasa.gov/sites/default/files/thumbnails/image/iss063e033443.jpg

Hitching a ride on the Mars Pathfinder mission, the Sojourner rover arrived on Mars on July 4, 1997. http://www.nasa.gov/sites/default/files/pathfinder_full.jpg

NASA astronaut Robert Behnken works during the Wednesday, July 1, 2020, six-hour and one-minute spacewalk to swap an aging nickel-hydrogen battery for a new lithium-ion battery on the International Space Station's Starboard-6 truss structure. http://www.nasa.gov/sites/default/files/thumbnails/image/iss063e034203.jpg

A multitude of magnificent, swirling clouds in Jupiter's dynamic North North Temperate Belt is captured in this image from NASA's Juno spacecraft. http://www.nasa.gov/sites/default/files/thumbnails/image/pia22692_hires.jpg

Technicians at NASA’s Kennedy Space Center in Florida recently finished meticulously applying more than 180 blocks of ablative material to the heat shield for the Orion spacecraft. http://www.nasa.gov/sites/default/files/thumbnails/image/ksc-20200702-ph-ilw01_0039.jpg

Space Shuttle Atlantis' STS-135 mission launched from Launch Pad 39A at Kennedy Space Center on July 8, 2011 and was the last space shuttle mission. http://www.nasa.gov/sites/default/files/thumbnails/image/18708875244_52c82cd0ce_o.jpg

An electric Hall thruster, identical to those that will be used to propel NASA's Psyche spacecraft, undergoes testing at NASA's Jet Propulsion Laboratory. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23879-1041.jpg

A young star's unseen, planet-forming disk casts a huge shadow across a more distant cloud in a star-forming region. http://www.nasa.gov/sites/default/files/thumbnails/image/50045549941_b8aa2c8417_o.png

In this image, NASA's Mars 2020 Perseverance rover waits to be lifted onto its Atlas V launch vehicle at the Cape Canaveral Air Force Station in Florida on July 7, 2020. http://www.nasa.gov/sites/default/files/thumbnails/image/pia23984-16.jpg

The crew snapped this starry nighttime shot of Rio de Janeiro and surrounding cities on the Brazilian coast, as the International Space Station orbited above São Paolo. http://www.nasa.gov/sites/default/files/thumbnails/image/iss063e039001.jpg

On July 17, 1975, something momentous happened: two Cold War-rivals met in space. When their respective spacecraft rendezvoused and docked, a new era of cooperative ventures in space began. http://www.nasa.gov/sites/default/files/images/260346main_astp_hatch_full_full.jpg

At 9:32 a.m. EDT on July 16, 1969, the Apollo 11 mission launched via a Saturn V rocket on a mission to the Moon. http://www.nasa.gov/sites/default/files/thumbnails/image/apollo_11_launch_-_gpn-2000-000630_1.jpg

On July 21, 1969, command and service module pilot Michael Collins photographed this close-up view of the docking target on the Apollo 11 Lunar Module from the Command Module. http://www.nasa.gov/sites/default/files/thumbnails/image/as11-36-5365.jpg

NASA is developing technologies to send humans to the Red Planet. http://www.nasa.gov/sites/default/files/thumbnails/image/2-heat_shield.jpg

Comet NEOWISE streaked across the sky above the tree line of Lone Pine Lake, located on the Mount Whitney Trail in the Eastern Sierra Nevada Mountains in California. http://www.nasa.gov/sites/default/files/thumbnails/image/afrc2020-0073-1.jpg

This image, taken on July 24, 1969, shows the Apollo 11 command codule and the Mobile Quarantine Facility (MQF) are photographed aboard the USS Hornet http://www.nasa.gov/sites/default/files/thumbnails/image/s69-40758.jpg

Carried by a balloon the size of a football stadium, ASTHROS will use a telescope to observe wavelengths of light that aren't visible from the ground. http://www.nasa.gov/sites/default/files/thumbnails/image/high-altitude-balloon-1041.jpg

This image of Jezero Crater, the landing site for the Mars Perseverance Rover, was taken by instruments on NASA's Mars Reconnaissance Orbiter. http://www.nasa.gov/sites/default/files/thumbnails/image/jezerocrater.jpg